Finite Element Analysis in the Estimation of Air-Gap Torque and Surface Temperature of Induction Machine

Abstract

This paper presents electromagnetic and thermal behavior of Induction Motor (IM) through the modeling and analysis by applying multiphysics coupled Finite Element Analysis (FEA). The prediction of the magnetic flux, electromagnetic torque, stator and rotor losses and temperature distribution inside an operating electric motor are the most important issues during its design. Also prediction of these issues allows design engineers to estimate whether the machine is capable for the proposed application and its temperature class for which it is being designed ensuring normal motor operation at rated conditions. In this work, multiphysics coupled electromagnetic – thermal modeling and analysis of induction motor at rated and high frequency has carried out applying Arkkio’s torque method. Numerical modeling and finite element analysis carried using COMSOL Multiphysics software. Transient electromagnetic torque, magnetic field distribution, speed-torque characteristics of IM were plotted and studied at different frequencies. This proposed work helps in the design and prediction of accurate performance of induction motor specific to various industrial drive applications. Results obtained are also validated with experimental analysis. The main purpose of this model is to use it as an integral part of the design aiming to system optimization of Variable Speed Drive (VSD) and its components using coupled simulations.